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1、Reading,What is the greenhouse made and used for?,A greenhouse is made of glass and is used for growing plants, especially during cold weather.,How does it work? The air inside is warm because the glass traps the heat from the sun and keeps it from escaping. This makes the greenhouse heat up and so
2、the plants can grow throughout the cold period.,What are the “greenhouse gases”? In the atmosphere surrounding the earth there are gases, which are called “greenhouse gases”, including carbon dioxide, methane(甲烷, 沼气) and water vapor.,What do you think greenhousegases do? They trap heat from the sun
3、and therefore warm the earth.,( Paragraph 1 ),Introduce a debate over the issue of global warming.,Raising a question,Reading,(Paragraphs 2-3 ),Illustrate how global warming comes about.,Giving examples, using graphs, explanation.,(Paragraphs 4-5 ),List two different attitudes among scientists towar
4、ds global warming.,Giving examples, making contrast.,(Paragraph 6 ),Its up to readers to think and decide whether people should do something about global warming or not.,Using a question, leaving readers to think over the issue.,Read the text carefully and fill in the blanks.,gases,quantities of,glo
5、bal temperature,catastrophe,high levels,consequences,States,positive,Choose the best answers.1. Which of the following is TRUE according to the text?A. The temperature of the earth increased about one degree Fahrenheit during the 20th century.B. The carbon dioxide content in the air increased by 70
6、parts per million from 1957 to 1997.C. All scientists accept the data in graph 2 except Charles Keeling.D. Janice Foster says that more carbon dioxide will make plants grow faster.,A,2. Which of the following is Dr Janice Fosters opinion?A. The result of the temperature increase will be serious.B. T
7、he amount of warming is nothing serious.C. We neednt worry about high levels of carbon dioxide.D. Global warming is a natural phenomenon.,A,浓度单位,Glance quickly at the magazine article and answer the questions.Who wrote the magazine article? What is the name of the magazine? Sophie Armstrong wrote th
8、e magazine article. The name of the magazine is Earth Care.,What are the names of the three scientists mentioned in the article? They are Dr. Janice Foster, Charles Keeling and George Hambley.,3. What do they think about global warming? Do they agree with one another? They dont agree with each other
9、. Dr. Janice Foster thinks the effects of global warming could be very serious.,George Hambley thinks global warming will be mild with few bad environmental consequences. Charles Keeling believes it is the burning of more and more fossil fuels that is resulting in a big increase in carbon dioxide.,W
10、hat are the two graphs about? Graph I shows the temperature increase of one degree Fahrenheit between 1860 to 2000. Graph 2 is about the carbon dioxide content in the atmosphere, 1958-1990.,What is the main topic of the article? Global warming/ the warming of the earth.,2. True: 3, 5, 6, 7, 8 False:
11、 1, 2, 4, 9, 10Correct sentences:1. The temperature last century increased much.2. Not everyone believes that global warming is caused by human activities.,4. Natural gas is not a greenhouse gas but a fossil fuel.9. George Hambley thinks that more carbon dioxide is a positive thing and it will make
12、plants grow faster.10. It is unknown what the effects of global warming will be.,DebateInstructions Get into groups of six. Decide which three in your group are going to agree with the statement (Group A) and which three are going to disagree with the statement (Group B)., Group A discuss why they a
13、gree with the statement; Group B discuss why they disagree. Group A and B get together. Tell each other the reasons why agree or disagree with the statement.,Supplementary materials for debating Global warming 1. The planet has warmed anywhere from 0.5 to 1.0C (1 to 2F) over the last century.,This s
14、mall amount makes a huge difference, causing glaciers to melt and, potentially (潜在的), sea level to rise. We could see even more of this in the future, (maybe another 3C, or 5F),global warming,global warming,2. A definition of global warming would have to include a measurable, consistent temperature
15、rise, like the one we have seen in recent history. A question remains Is it an unusual change? Much debate about that one.,3. The earth gets one kind of energy (visible light) from the sun and gives off another kind (infrared红外线). This kind is what gets trapped by green house gases (GHGs) in the atm
16、osphere.,Green house gases4. The global warming green house effect really is a bogus(假的) term. A greenhouse keeps warm by physically trapping the air inside and preventing convection(对流). The atmosphere helps keep the planet warm by trapping outgoing radiation instead.,5. The leading gasses are Carb
17、on-dioxide, Methane, Ozone(臭氧) and Nitrous Oxide(一氧化二氮). Gas analyzers show the concentrations of this stuff have increased somewhat since the beginning of the industrial revolution.,6.The greenhouse effect raises the average temperature of the Earth by more than 30 degrees, so without it the Earth
18、would be a very cold place!,green house effect,green house effect,GREENHOUSE Feeling helpless to do anything about global warming? Find out how one family cut their own personal greenhouse-gas emissions by 65 percent-and how you can do the same.,green house effect,Homework 1. Read the passage again and review the new words and expressions. 2. Prepare the debate in groups. 3. Preview Using Language - WHAT CAN WE DO ABOUT GLOBAL WARMING?,